72 * INDEX.

The Projection of heavy Bodies (i.) p. 99. n. 208. andsol.

Pulley (1.) />. 27. ». 82, 83. p. 40. ». i l§. and foJ.Common Pumps (r.) p. 236. n. 472.

R.

Radiant Pom? (2.) p. 40. n. 645.

Rainbow. See Iris.

Ray of Light (2.) p. 23. n. 610.

- diverging (2.) p. 39. n. 643.

.—- converging, p. 40. n. 648.

_- ~ incident, p. 28. n. 620.

-- refracted, ibid. n. 620.

-- reflected, p. 81. n. 780.

_ — homogeneous , p. 108. n. 849-

— heterogeneous, ibid. n. 850.

____ they manse in curve Lines in the Air , p. 178.

n. 1056.

Reflexion of Light from Bodies (2.) p. 58. n. 710.

- . — . from a polish'd Surface (2.) p. 81. n. 779.

--- its Laws, ibid. n. 783. and sol.

— - - it has a great relation with Refraction, p. 86.

n. 795. and sol.

Black Bodies reflect no Light, p. 107. n. 845.

Refraction of Light (2.) p. 26. n. 6x6.

■ > when caused, ibid. n. 617.

- ■ — whence it arises, ibid. n. 618.

■ "■I its Laws, p. 28. n. 624. and sol.

A constant Proportion between the Sine of Incidence and theSine of Refraction, p. 37. n. 639.

The Cause of this Effect, p. 31. n. 633. and sol.

The Laws of Refraction in Mediums divided by the planeSurface, p. 39. n. 643. in: Mediums divided, by a sphe-rical Surface, p. 44. n. 660.

Refraction of the Stars, p. 188. n. 1110. and sol.Refrangibility different in different Rays (2.) p. 108.n. 847.

-- constantly the fame in single Rays, p. 115. n. 855.

— -- the greater it is, the more easily are Rays reflected,

p. X22. n. 868. Repul-